Team up with another student in the class
Choose an existing application or system that you can access in class, on your phone or laptop (Tufts SIS, Piazza, course web site, anything you like)
Imagine two simple and most typical uses of the system
Perform a simple "usability evaluation"
Step through each of your tasks
One person uses the system, the other takes notes; switch roles for the second task
Note problems the user had
Note anything a new user might not know how to do
Also consider efficiency
Also think about the goal of the product, what value does it provide?